Alarms malfunctioning

Been using Toodledo for a couple of years at least with great results. Now I am seeing alarm malfunctions where an alarm goes off a day early, or if I move an alarm say an hour from the original alarm time, it goes off at the earlier time.

I have set alarms to come from the device as I always have. Have deleted all local data and synced from website. Have even reinstalled on both iPhone and iPad and still I keep getting unreliable alarm behaviour.